US17634A - Machine fob stbaiokhtening knife-blades - Google Patents

Description

UNITED sTATEs PATENT oEEioE.

HIRAM PIERCE, OF CLAREMONT, NEV HAMPSHIRE.

MACHINE FOR STRAIGHTENING KNIFE-BLADES.

Specification of Letters Patent No. 17,634, dated June 23, 1857.

To all whom it may concern:

Be it known that I, HIEAM PIERCE, of Claremont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements in Machinery for Straightening Knife-Blades; and I do hereby declare the following to be a full, clear, and eXact description of the same, reference being had to the accompanying drawing and to letters of reference marked thereon.

My invention relates to improvements in the dies usually employed, in conjunction with a drop weight, for straightening knife blades, and consists in so arranging the upper or lowei` die, or both, as to be selfadjusting, thereby allowing the faces of the two dies to accommodate themselves to the tapering form of the blades.

Myinvention has for its aim the straightening of blades and imparting to their bolsters and tangs, their roper form and position, and this without t e necessity of submitting the blades to more than one heat.

In order to enable others skilled in the art to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the drawing which forms a part of this specification, Figure 1 is a front elevation of a machine for straightening knife blades with my improvements on the same. Fi 2, an edge view; Figs. 3 and 4 sectiona vviews drawn to an enlarged scale and illustrating the mode of rendering the up er die self adjusting.

Simi ar letters refer to similar parts throughout the several views.

A is the base of the machine to which are secured the two guides or pillars B and Bl connected together at the top by the crossbar C.

D is a drop weight guided by the pillars B and B and suspended to a band E which is attached to and arranged to be wra ped around the pulley F, the latter being lbose on the shaft G which turns in boxes a, a, secured to the pillars. On the same shaft G is a clutch having projections adapted to recesses in the face of the pulley F. This clutch is arranged to slide freely on the shaft but not to turn independently of the same.

I is a bell crank lever turning a pin attached to the column B, the bent arm of the lever terminating in a projection which iits between the collars on the clutch H and the straight arm of the lever being connected to the rod J which iskarran ed to slide in guides attached to the pillar On the rod J are secured an upper catch b, and lower catch c, both being so situated as to be struckrby a bar d, attached to and projecting from the drop weight D.

K is a spring treadle jointed to the base A and connected by means of a rod L to the lever M which passes through the pillar B, and has its fulcrum on a inattached to the same, the point of the ever projecting a short distance from the inside of the pillar. j

N is a crosshead, secured to the two pillars and in this crosshead slides the rod O which is furnished at the top with a collar e, and between the latter and the top of the cross-head intervening a spiral spring f. The rod O is furnished with another collar 7L below which it terminates in the spherical end g one-half of the latter, fitting into a hemispherical recess in the plate i, in which position it is retained by the upper plate j. To the plate t is secured the upper die P and to the base late another die Q both dies having steel aces, adapted to the blades to be straightened, and having suitable recesses c for the bolster d of the blade R. The pins r attached to the lower die, serve as guides' for the upper die. A strap from any adjacent shaft being applied to a pulley S on the shaft Gr so that the latter may revolve in the direction of the arrow, the band E is wound around the pulley F, with which the clutch H is now in gear, and consequently the weight D is elevated until the projection d strikes the catch b when the rod J is raised and the bell crank lever I so moved as to throw the clutch H out of gear from the pulley I when the latter can turn freel on the shaft G Vand the weight D may fall it is however retained by the point of the lever M until the attendant presses down the spring treadle, when the weight is released, and falling strikes the top of the rod O thereby submitting the heated blade R to the percussion imparted to the upper die. Simultaneously with the dropping of the weight, the projection d struck the inclined catch on the rod J, the descent of which had moved the lever I so as to throw the clutch H in gear with the pulley F, consequently as the shaft continues to revolve the Weight will be raised as before, preparatory to being again caused to fall by operating the treadle. As the Weight is raised from contact With the rod O the spiral spring elevates the said rod and With it the upper die to a height limited by the collar h. The heated blade R is submitted to a series of such percussions until it be'- comes perfectly straight7 and until its bolster and tang assume the required form and position. In thus rendering the u per die adjustable by means of the spherica end of the rod O, the above object is attained Without constantly re-heating the blade which has hitherto been a matter of necessity and consequent cause of delay in former contrivances used for eecting the saine purose. p I do not desire to claim the devices for raising and dropping the Weight, and I do lLetters Patent is:

The ein loyment in conjunction with a drop Weig t of self adjusting dies in the manner, and for the purpose herein set forth.

In testimony whereof, I have signed my naine to this specification before tWo subscribing Witnesses.

HIRAM HEROE.'

Witnesses:

CHAs. BARDWELL, Oris F.'R. VVAITE.V

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